156 Lathe Tools. and nut E on the right is for releasing the keys or for stead)*" them. This tool is made by the Britannia Company. >/ Cutting Tools for Lathes.—There are various opini1 on the proper shapes of these. Fig. 155 shews the most comii^ where A is the plan of a straight tool, B that of a right hand H and c of a left hand tool; D being elevation for all three. Tb 1.; PLAN OF LIFT-HANQ root.